By the way if people are interested in chiastic structure in the Star Wars saga then this is a great read, also more believable and something that people here would appreciate more: http://dejareviewer.com/2014/05/20/cinematic-chiasmus-the-empire-strikes-back-is-a-perfectly-symmetrical-film/
(By the way I posted that article awhile ago in general discussion but no one commented so I thought it'd be worth posting again.)